The utility model discloses an
insulin injection pen, and belongs to the technical field of
medical instruments. Comprising a main body shell, a connecting sleeve and a
medicine bin, and the main body shell is connected with the
medicine bin through the connecting sleeve; the adjusting mechanism comprises a dosage rotating cylinder and a transmission
pipe, the dosage rotating cylinder is arranged in the main body shell and is in threaded connection with the main body shell, and the transmission
pipe is arranged in the dosage rotating cylinder and is in
clutch connection with the dosage rotating cylinder; the driving mechanism is arranged in the transmission
pipe, and the driving mechanism is matched with the connecting sleeve to form an injection
sound production structure; the
insulin injection pen is switched from a
dose adjusting state to an injection state through up-down separation and reunion of the transmission tube, and injection administration is performed through the driving mechanism. The connecting sleeve is made of a plastic part with high
hardness, even if the medicament
bottle gives reactive force to the driving mechanism during injection, the matching precision between the driving mechanism and the connecting sleeve is not affected, the reliability of the injection
sound production structure is improved, and the problem of deformation or failure possibly occurring after the reactive force during long-term injection administration is avoided.